Abstract
Composite material obtained with modified lead titanate (Pz34) ferroelectric ceramic and polyether-ether-ketone (PEEK) polymer matrix was used as sensitive component to measure X-ray intensity in a novel detection system. The sensing element works as a thermal transducer, converting a non-quantified thermal flux into an output measurable quantity of electrical voltage. The samples were obtained up to 60 vol.% of ceramic, by hot pressing the mixture of Pz34 and PEEK powders at 368 °C and applying 12 MPa pressure for 2.0 hours. The sensor response varies from 2.70 to 0.80 V in the energy fluence rate range of 6.30 to 37.20 W.m-2. The absorbed incident energy was analyzed as a function of the ionizing energy. Furthermore, by measuring the pyroelectric activity of the composite film it was observed that there is no degradation of the sensor after the irradiation.
Highlights
Ferroelectric polymers, ferroelectric ceramics and related materials have been used as thermal transducer due to their pyroelectric activity
Pz34/PEEK composite film with 60 vol.% of ceramic was poled at 130 °C for 1 hours
The reversible pyroelectric current was established after removing all contributions to the irreversible thermally stimulated discharge current (TSDC) current, which occurred after 3rd TSDC run
Summary
Ferroelectric polymers, ferroelectric ceramics and related materials have been used as thermal transducer due to their pyroelectric activity. Radiant energy, both ionizing (X-ray, protons, neutrons) and non-ionizing (infrared, microwaves, UV) are monitored by these sensors[1,2,3,4]. Pyroelectric detectors offer an advantage of room temperature operation and wide spectral response. Material such as triglycine sulphate (TGS), lithium tantalate, and lead zirconate titanate (PZT) have been used as pyroelectric elements in many devices. A ferroelectric ceramic/polymer composite is presented as an alternative pyroelectric detector to measure X-ray intensity in the orthovoltage range (120 – 300 kVp). The composite material combines good properties of each single material, offering some advantages in comparison with single crystalline materials or ferroelectric perovskite ceramics
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